A187701 Number of (n+1)X(n+1) 0..2 arrays with each 2X2 subblock off diagonal and antidiagonal nonsingular and the array of 2X2 subblock determinants antisymmetric about the diagonal and antidiagonal.

31, 1489, 72, 5030, 36, 7410, 474, 176936

Offset: 1

Author

R. H. Hardin Mar 12 2011

Keywords

• nonn

Comments

Column 2 of A187705

Examples

			Some solutions for 4X4
..0..2..0..0....0..0..1..1....0..0..2..1....0..2..0..0....0..0..1..0
..0..1..1..1....2..1..1..1....2..1..2..1....0..2..1..2....2..2..1..0
..2..2..2..0....1..1..1..2....0..1..2..2....1..2..1..0....1..2..1..2
..0..0..1..0....1..1..0..0....0..1..0..0....0..0..1..0....1..2..0..0